NEWOPTO ALS21C-K1 I2C SMD Ambient Light Sensor Module
NEWOPTO ALS21C-K1 I2C SMD Ambient Light Sensor Module - Image 2
SKU: SENS-3228
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NEWOPTO ALS21C-K1 I2C SMD Ambient Light Sensor Module

₹51.00 (Inclusive of all taxes)
Out of Stock

The NEWOPTO ALS21C-K1 is an I2C digital ambient light sensor module designed for SMD assembly, featuring a wide 1.7V to 3.6V operating range for direct integration with 3.3V microcontrollers like ESP32, STM32, and Raspberry Pi. It provides precise light intensity measurement for automatic display backlight and system power management.

Features

  • I2C digital interface for direct microcontroller connection
  • Wide operating voltage range from 1.7V to 3.6V
  • Extended industrial temperature range from -40°C to +85°C
  • Compact SMD package for space-constrained PCB designs
  • ROHS compliant for environmentally conscious manufacturing

Out of stock

Description

The ALS21C-K1 is a surface-mount ambient light sensor that converts light intensity into a digital signal via its integrated I2C communication interface. Its spectral response is engineered to closely match the human eye’s photopic vision, ensuring accurate ambient light assessment for adaptive brightness control systems.

Built for reliability in demanding environments, the sensor operates across an industrial temperature span and features low power consumption, making it suitable for battery-powered IoT devices, consumer electronics, and industrial control panels. The integrated infrared filtering enhances measurement accuracy by minimizing the impact of non-visible light sources.

Key Features

  • I2C digital output for simplified system integration and noise immunity
  • Broad supply voltage compatibility from 1.7V to 3.6V
  • Robust performance across an extended -40°C to +85°C temperature range
  • Human-eye matched spectral sensitivity with integrated IR rejection filter
  • Compact SMD footprint optimized for automated PCB assembly processes
  • Low-power design ideal for always-on, battery-operated applications
  • ROHS-compliant construction meeting global environmental standards

Applications

  • Automatic brightness adjustment for smartphone, tablet, and laptop displays
  • Energy-saving backlight dimming in industrial HMIs and control panels
  • Ambient light monitoring in smart home IoT devices and sensor nodes
  • Photometric data logging for environmental and building automation systems
  • Light-sensitive triggering in security and surveillance equipment

Technical Specifications

ManufacturerNEWOPTO
Manufacturer Part Number (MPN)ALS21C-K1
Package / CaseSMD
Operating Voltage1.7 VDC to 3.6 VDC
Operating Temperature-40°C to +85°C
Communication InterfaceI2C
ComplianceROHS
FunctionAmbient Light Sensor (ALS)

Frequently Asked Questions

What is the operating voltage range for the ALS21C-K1 sensor?

The ALS21C-K1 operates from 1.7V to 3.6V DC, making it directly compatible with common 3.3V logic systems found in microcontrollers like ESP32, STM32, and Raspberry Pi without requiring a level shifter.

How do I communicate with this ambient light sensor?

The sensor uses a standard I2C digital communication interface. You will need to connect the SDA (data) and SCL (clock) lines to your microcontroller, along with power and ground, and use the appropriate I2C library to read the digital lux values.

What is the sensor's spectral response and accuracy?

The ALS21C-K1 is designed with a spectral sensitivity that closely matches the human eye's photopic response. It includes an infrared filtering layer to minimize the effect of IR light, providing high accuracy for applications like automatic display brightness adjustment.

Can this sensor be used in outdoor or industrial environments?

Yes, with an operating temperature range of -40°C to +85°C, the ALS21C-K1 is suitable for harsh industrial environments and outdoor applications where temperature extremes are expected, provided it is properly housed and protected from direct environmental exposure.

Package Includes

  • 1 x NEWOPTO ALS21C-K1 I2C SMD Ambient Light Sensor

Additional Information

Weight 0.01 kg
Dimensions 10 × 8 × 5 cm

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